That anticipated quarterback battle during Colorado spring drills between sophomore-to-be Nick Hirschman and sophomore transfer Connor Wood is on hold.

According Colorado’s current injury report, Hirschman required off-season surgery to correct an ankle injury that had bothered him since August camp. He is listed as “questionable” for spring drills, which begin March 10.

The injury report stated that it is too early to determine whether Hirschman will be available for the spring session. The spring game is scheduled for April 14.

Hirschman, who saw limited action as a redshirt freshman in 2011 behind senior Tyler Hansen, is expected to battle Wood for the 2012 starting job. Wood, a former four-star bluechipper during his high school days in Houston, transferred from the University of Texas just before the 2011 season and sat out the year per NCAA transfer rules. Wood, who redshirted during his only year in Austin, will have three seasons of eligibility at CU.

Barring attrition, other quarterbacks on CU’s roster include senior-to-be Brent Burnette and redshirt freshmen John Schrock and Stevie Joe Dorman.

Touted quarterback recruit Shane Dillon from San Diego Christian High School is expected to sign with Colorado during national signing day on Feb. 1 and arrive on campus during the summer.